ATAR080 datasheet(23/68 Pages) ATMEL

23 / 68 page

ATAR080

4675D–4BMCU–12/04

Port 2 Data Register (P2DAT)

Bit 3 = MSB, Bit 0 = LSB

Port 2 Control Register (P2CR)

Value 1111b means all pins in input mode

Bi-directional Port 5

This, and all other bi-directional ports include a bitwise programmable Control Register

(P5CR), which allows individual programming of each port bit as input or output. It also

opens up the possibility of reading the pin condition when in output mode. This is a use-

ful feature for self testing and for serial bus applications.

The port pins can also be used as external interrupt inputs (see Figure 23 on page 24

and Figure 24 on page 24). The interrupts (INT1 and INT6) can be masked or indepen-

dently configured to trigger on either edge. The interrupt configuration and port direction

is controlled by the Port 5 Control Register (P5CR). An additional low resistance pull-

up/-down transistor mask option provides an internal bus pull-up for serial bus

applications.

The Port 5 Data Register (P5DAT) is I/O mapped to the primary address register of

address '5'h and the Port 5 Control Register (P5CR) to the corresponding auxiliary reg-

ister. The P5CR is a byte-wide register and is configured by writing first the low nibble

then the high nibble (see section “Addressing Peripherals”).

Primary register address: '2'hex

Bit 3

Bit 2

Bit 1

Bit 0

P2DAT

P2DAT3

P2DAT2

P2DAT1

P2DAT0

Reset value: 1111b

Auxiliary register address: '2'hex

Bit 3

Bit 2

Bit 1

Bit 0

P2CR

P2CR3

P2CR2

P2CR1

P2CR0

Reset value: 1111b

Table 10. Port 2 Control Register

Code

3 2 1 0

Function

x x x 1

BP20 in input mode

x x x 0

BP20 in output mode

x x 1 x

BP21 in input mode

x x 0 x

BP21 in output mode

x 1 x x

BP22 in input mode

x 0 x x

BP22 in output mode

1 x x x

BP23 in input mode

0 x x x

BP23 in output mode

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